where to put canonical tags?

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Hi,

I would like to put some canonical tags on my site, but I dont know where i have to put them. 

 

Lets take an example:

 

I would like this url: http://bosslife.dk/46-m%C3%B8nster-butterflys

 

to point at this: http://bosslife.dk/35-butterfly <- I want this to be the main url.

 

I know that i have to put this line in the head section of the first url : <link rel=”canonical” href=”http://bosslife.dk/35-butterfly″ /> 

But i dont know where to find the code for : http://bosslife.dk/46-m%C3%B8nster-butterflys

 

Can i just put the canonical tag in the header.tpl file, or do i have to find the specifik file for the category sites? If yes, where do i find them? 

 

Thank you